Evidence map›Paper›PMID 31209540›Full record

ArticleKnee surgery, sports traumatology, arthroscopy : official journal of the ESSKA2020

Ten-year clinical and radiographic results of 1000 cementless Oxford unicompartmental knee replacements.

Hasan R Mohammad, James A Kennedy, Stephen J Mellon, Andrew Judge, Christopher A Dodd, David W Murray

Abstract read
In one paragraph

Article in Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
34citing papers in PubMed, 4 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

34 citing papers in PubMed, 4 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Pooled it
  4. Cementless unicompartmental knee replacement achieves better ten-year clinical outcomes than cemented: a systematic review.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2021
    Pooled it
  5. Article
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  7. Unicompartmental knee arthroplasty in patients with Parkinson's disease.Archives of orthopaedic and trauma surgery · 2026
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  19. Fixed-bearing is superior to mobile-bearing in lateral unicompartmental knee replacement: a retrospective matched-pairs analysis.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2023
    Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

Hasan R MohammadNuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK. hasanmohammad@doctors.org.uk.ORCID http://orcid.org/0000-0002-2146-8601
James A KennedyNuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
Stephen J MellonNuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
Andrew JudgeNuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.
Christopher A DoddOxford University Hospitals NHS Foundation Trust, Nuffield Orthopaedic Centre, Oxford, UK.
David W MurrayNuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeUnicompartmental knee replacement (UKR) has substantial benefits over total knee replacement (TKR) but has higher revision rates. The cementless Oxford UKR was introduced to address this but there are concerns about fixation and tibial plateau fractures. The first long-term study of the device with clinical and radiographic outcomes is reported.

methodsThe first 1000 medial cementless Oxford UKR were prospectively identified and followed up by independent physiotherapists. Survival was calculated using the endpoints reoperation, revision, revision to TKR, major revision requiring revision TKR components and patient mortality. The Oxford Knee Score (OKS), Tegner Activity Score and American Knee Society Score (AKSS) were recorded and radiographs analysed.

resultsThe ten year survival was 96.6% (CI 94.8-97.8), 97.5% (CI 95.7-98.5), 98.9% (CI 97.7-99.4) and 99.6% (CI 98.8-99.9) using reoperation, revision, revision to TKR and major revision as the endpoint, respectively. Commonest causes for revision were bearing dislocation (n = 7, 0.7%), disease progression (n = 4, 0.4%) and pain (n = 2, 0.2%). There was one lateral tibial plateau fracture and one femoral component loosening. At 10 years, the mean OKS was 41.2 (SD 9.8), Tegner 2.8 (SD 1.3), AKSS-O 89.1 (SD 13.0) and AKSS-F 80.4 (SD 14.6). There were no pathological radiolucencies or complete radiolucent lines. There were no implant-related deaths.

conclusionsThe cementless Oxford UKR is a safe procedure with excellent long-term clinical results. Our results suggest that reliable fixation was achieved with only one (0.1%) revision for loosening (femoral), no radiographic evidence of loosening in the remaining cases and no fractures related to implantation. LEVEL OF EVIDENCE: III.

Indexed as

AdultAgedArthroplasty, Replacement, KneeCementationDisease ProgressionFemaleFollow-Up StudiesHumansKnee ProsthesisLysholm Knee ScoreMaleMiddle AgedOsteoarthritis, KneeOsteonecrosisProsthesis DesignProsthesis FailureCementless fixationLong-term outcomesUnicompartmental knee replacement

Identifiers

PMID31209540
PMCPMC7176592

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.